Linear Technology LTC3729, Manual

Page: 5 / 28

5
LTC3729
sn3729 3729fas
Internal 5V LDO Line Reg
Maximum Current Sense Threshold
vs Duty Factor
Maximum Current Sense Threshold
vs Percent of Nominal Output
Voltage (Foldback)
Maximum Current Sense Threshold
vs V
RUN/SS
(Soft-Start)
Maximum Current Sense Threshold
vs Sense Common Mode Voltage Current Sense Threshold
vs I
TH
Voltage
INTV
CC
and EXTV
CC
Switch
Voltage vs Temperature
Supply Current vs Input Voltage
and Mode
EXTV
CC
Voltage Drop
TYPICAL PERFOR A CE CHARACTERISTICS
U W
INPUT VOLTAGE (V)
0 5
0
SUPPLY CURRENT (
µ
A)
400
1000
10 20 25
3729 G04
200
800
600
15 30 35
ON
SHUTDOWN
CURRENT (mA)
0
EXTV
CC
VOLTAGE DROP (mV)
150
200
250
40
3729 G05
100
50
0
10 20 30 50
TEMPERATURE (
°
C)
– 50
INTV
CC
AND EXTV
CC
SWITCH VOLTAGE (V)
4.95
5.00
5.05
25 75
3729 G06
4.90
4.85
– 25 0 50 100 125
4.80
4.70
4.75
INTV
CC
VOLTAGE
EXTV
CC
SWITCHOVER THRESHOLD
INPUT VOLTAGE (V)
0
4.8
4.9
5.1
15 25
3729 G07
4.7
4.6
5 10 20 30 35
4.5
4.4
5.0
INTV
CC
VOLTAGE (V)
I
LOAD
= 1mA
DUTY FACTOR (%)
0
0
V
SENSE
(mV)
25
50
75
20 40 60 80
3729 G08
100
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
0
V
SENSE
(mV)
40
50
60
100
3729 G09
30
20
0
25 50 75
10
80
70
V
RUN/SS
(V)
0
0
V
SENSE
(mV)
20
40
60
80
1 2 3 4
3729 G10
5 6
V
SENSE(CM)
= 1.6V
COMMON MODE VOLTAGE (V)
0
V
SENSE
(mV)
72
76
80
4
3729 G11
68
64
60
1 2 3 5
V
ITH
(V)
0
V
SENSE
(mV)
30
50
70
90
2
3729 G12
10
–10
20
40
60
80
0
–20
–30
0.5 1 1.5 2.5